Differential number counts obtained within core and outskirts regions, with 3 mJy as the bin size of S​_850 μm. We show the blank field number counts from Geach et al. (2017, solid black curve) and from (Stach et al. 2018, solid red curve) as reference. The blank field number counts multiplied by factors of 2, 3, and 4 are shown as the dashed, dash-dotted, and dotted curves, respectively. The number counts from the literature are shown for comparison (Zhang et al. 2022; Li et al. 2023; Arrigoni Battaia et al. 2023; Zeng et al. 2024).